Finding the Fourth Proportional to 279,796.56, 419,776.88 and 90,253.12

Step by Step Solution

1. Step 1: Write the proportion equation
   279,796.56 : 419,776.88 = 90,253.12 : x
2. Step 2: Convert to fraction form
   279,796.56/419,776.88 = 90,253.12/x
3. Step 3: Cross multiply
   279,796.56x = 419,776.88 × 90,253.12
4. Step 4: Simplify right side
   279,796.56x = 37,886,173,123.87
5. Step 5: Solve for x
   x = 37,886,173,123.87/279,796.56
6. Step 6: Final answer
   x = 135,406.14